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Unformatted text preview: Heaton Mitchell T. Heaton Mrs. Brennan AP Biology 25 September 2009 Quiz #3 Study Guide (ANSWER KEY) _______ water _________________________________ What is the biological medium on Earth? _____ three-fourths ___________ What fraction of the Earths surface is covered by liquid water? ___ for 2 billion years ____________ How long did life evolve in water before spreading to land? _____ two-thirds _________________ About what fraction of an organism is composed of water? ____ covalent_ ______________________ Waters structure consists of an oxygen atom bound to two hydrogen atoms by what type of bond? ______ form hydrogen bonds ______________________ The single most outstanding property of water is its ability to do what? ___ 5 to 10% the strength of a covalent bond ________ In comparison to a covalent bond, what is the strength of waters hydrogen bonds? __ tetrahedron____ ___ What is the most stable arrangement of waters charges in which the two negative and two positive charges are approximately equidistant from one another?...
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